[1] Choiza and Gaeko originally met in the sixth grade but before forming CB Mass they began an underground hip hop group named Kod along with Sixpoint and ZASON, who joined in 1998.
In the first song of Dynamic Duo's first album Gaeko raps "He liked standing in front of mirrors than music/ He worshipped cash more than friendship/ What he left with us is only betrayal," in a thinly-veiled reference to Curbin.
[5] After CB Mass broke up, Gaeko and Choiza formed Dynamic Duo while Curbin announced plans to go solo but ultimately left the music industry altogether.
In this music video it features cameo appearances from members of The Movement, an alliance of Korean rappers, which was founded by Drunken Tiger, CB MASS, Uptown and Thanos.
[7] Other contributions on their albums include appearances by 서영은, Zason, 양키, P-Da (Tim), Bobby Kim, Juvie, 신지선, Dope Boyz, 윤미래, 에스더, DJ Wreckz, Mikieyes, Sean2slow, Insane Deegie, Yoon Mirae, Lee Tzsche, 이세진, dj honda, parrish PMD smith, headcrack, Yoo Jin Ah, Lee Ju Han, JK Kim Dong ook, Hey, Sin Ye Won, and Epik High.